The New Century Financial Corporation, for instance, waived its normal credit rules if home buyers put down large down payments, had substantial savings or demonstrated “pride of ownership.” The once-highflying lender, based in Irvine, Calif., filed for bankruptcy last year.

William J. McKay, who was the chief credit officer at New Century, said the company usually made exceptions so homeowners could borrow more money than they qualified for under its rules. In most cases, the decisions raised borrowers’ credit limits by 15 percent, he said.

New Century measured pride of ownership in part by how well buyers maintained their homes relative to their neighbors, Mr. McKay said, adding that this usually was not enough on its own to qualify a borrower for an exception.